The calculated radiative cooling rate coefficient for krypton as a trace impurity in low to moderate density plasmas is calculated. Collisional-radiative line emission, dielectronic recombination, radiative recombination and bremsstrahlung are considered as the principal radiative loss channels. Collisional-radiative models and the calculated charge state distribution for krypton have been benchmarked against measured ion brightness profiles in the FTU plasma. The calculated radiative loss rate is compared with two measurements of the radiative cooling coefficient for krypton in the FTU plasma. The measurements differ in how the krypton density profile is experimentally constrained. The krypton density profile is found (to be flat) from spectroscopic observations and (to be increasing radially outwards) from measurements of visible bremsstrahlung emission. The calculations show excellent agreement with the former set of measurements. Polynomial fits to the total radiative cooling coefficient are provided for ease of use in plasma modelling codes. Tables of ion emissivities are provided for use in modelling radiative losses from non-equilibrium plasmas.
低到中等密度等离子体中作为示踪杂质的氪的辐射冷却系数被计算。碰撞-辐射线发射、双电子复合、辐射复合和轫致辐射被视为主要的辐射损失通道。碰撞-辐射模型以及氪的电荷态分布计算结果已与FTU等离子体中测量的离子亮度分布进行了基准比较。计算得到的辐射损失率与FTU等离子体中氪的辐射冷却系数的两组测量值进行了比较。这两组测量在实验约束氪密度分布的方式上有所不同。氪密度分布从光谱观测结果来看是平坦的，而从可见轫致辐射测量结果来看则随半径向外增加。计算结果与前者吻合良好。为便于在等离子体建模代码中使用，提供了总辐射冷却系数的多项式拟合。还提供了用于模拟非平衡等离子体辐射损失的离子发射率表。